Improve documentation request for /proc/meminfo (proc.txt)

Improve documentation request for /proc/meminfo (proc.txt)

[Ulrich Windl]

Hi!

Reading /usr/src/linux/Documentation/filesystems/proc.txt leaves some questions open. For example some values are break-downs of others. I'd like to see documentation on how these relate. For example (3.0.101):

MemTotal:       132156332 kB
MemFree:        22448480 kB
Buffers:         1484072 kB
Cached:         81252832 kB
SwapCached:            0 kB
Active:         24216920 kB
Inactive:       65789500 kB
Active(anon):   20268724 kB
Inactive(anon):  4617808 kB
Active(file):    3948196 kB
Inactive(file): 61171692 kB
Unevictable:       48840 kB
Mlocked:           30444 kB
SwapTotal:      20964788 kB
SwapFree:       20964788 kB
Dirty:               496 kB
Writeback:             0 kB
AnonPages:       7317972 kB
Mapped:         15927688 kB
Shmem:          17602008 kB
Slab:            1162160 kB
SReclaimable:     907496 kB
SUnreclaim:       254664 kB
KernelStack:        8864 kB
PageTables:      1361780 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    79158152 kB
Committed_AS:   66056192 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      305164 kB
VmallocChunk:   34292267888 kB
HardwareCorrupted:     0 kB
AnonHugePages:   4997120 kB
HugePages_Total:    7700
HugePages_Free:       62
HugePages_Rsvd:       44
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      301296 kB
DirectMap2M:    19611648 kB
DirectMap1G:    114294784 kB

Which numbers sum up to MemTotal? It seems Active(anon) + Active(file) == Active (and similar for inactive).
What is the relation between Unevictable and Mlocked? Is "Unevictable >= Mlocked" all the time?
It would give some insight how things work if you document the relations between some of these numbers.

(I'm hunting for a condition for very bad disk response times, suspecting some memory pressure. I suspect too many dirty pages for some reason...)

Regards,
Ulrich





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